Question 781670
|Two cyclists, A and B are 100 km apart travelling toward each other.|


That suggests we would look for the sum of distances traveled.



|  Cyclist A has a velocity of 20 km/h south while cyclists B velocity is 15 km/h north.  Find time at which each cyclist passes each other.|


They each travel the same amount of time and their distances each traveled will be different.

Let h = unknown time when distance between A and B travelers is closed.


{{{20*h+15*h=100}}}
{{{35h=100}}}
{{{h=100/35=20/7=highlight(2&6/7)}}} hours.